Improvement in springs for doors, gates



R. ESP-EY.

Springs for Doors, Gates, &c.

N0. 135,192. v Patentedjan.21,1873.

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UNITED STATES PATENT FFICE ROBERT ESPEY, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN SPRINGS FOR DOORS, GATES, &c.

Specication forming part of Letters Patent No. 135,192, dated January21, 1873' To all whom it may concern:

Beit known that I, ROBERT EsPnY, of the city and county of St. Louis andState of Missouri, have invented a certain Improvement in Springs forDoors, Gates, Sto., of which the following is a specification:

This invention relates to the upper attachlnent of a spiral door-spring;and consists in the manner of preventing the adjusting-pin (to which theend of the spring is att-ached) from turning in the collar, by which itis secured to the door or side facing. This is done by means of a keyfitting in seats in both the pin and collar; the collar having twokey-seats a greater distance apart than those in the pin to allow thepin to be adjusted to the required nicety without cutting too manykey-seats therein, as hereafter described.

Figure 1 shows the parts detached and in perspective. Fig. 2 is a sideelevation of my improvement. Fig. 3 is a transverse section at' the lineX X, Fig. 2.

A is the adjusting-pin, having a flattenedN portion, b, around which theupper end ofthe spring B is tightly coiled, the said spring being of theusual form, and having its lower end similarly attached to the bracketC. The head ot' the pin A has a number of holes, a, for the introductionof a lever-pin to turn the adjusting-pin in its socket. D are key-seats,that may be as numerous as the pin will allow without too much weakeningthe metal between the seats. I have adopted four as the maximum numberthat the pin may have without too much weakening the spaces d betweenthe key-seats, and cutting away too much of the surface bearing againstthe socket. E is the socket bracket, having screw- F is the socket,havholes e for attachment.

ing two key-seats, f f at a distance oi" one hundred and thirty-livedegrees, (the key-seats D of the pin being ninety degrees apart,) sothat when one of the key-seats D is in conjunction with the key-seat f',as shown, that f will be midway between two of those D. This arrangementallows of the adjustment of the pin A to one-eighth of a turn, as may beseen by reference to Fig. 3. Supposing the key Gr to be in the key-seatf', then, if after the key has been drawn out, the pin is turnedone-eighth around, one oi' the key-seats D will be brought inconjunction with the key-seat f.

It generally happens that when the spring needs adjustment one -fourthof a turn is too great an alteration, and to give more nice adjustmentwithout injury to the bearing-surfaces d, or rendering the sides of thekey-seats D too weak to stand the strain, (by narrowing the spaces d,) Ihave contrived my improvement. It the surfaces d are made narrow theywill be liable to catch in the key-seats ff', and the pin will have nosteady bearing in the socket.

I claim as my invention- The pin A and socket-bracket E F, eachconstruct-ed with longitudinal grooves relatively spaced, to operate asdescribed, in combination with the key G, adapted to occupy 'thekey-seats successively formed by the rotation of the pin, to adjust thespring, substantially as herein set forth, for the purpose specified.

In testimony of which invention I have hereunto set my hand.

ROBERT ESPEY.

Witnesses:

SAML. KNIGHT, STEPH. BERNARD.

